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In July 2026, a landmark progress was achieved in China's epoxy polyether silicone oil industry: after nearly ten years of technical research and industrial iteration, the high-end modified silicone oil product with both epoxy active groups and polyether hydrophilic segments has officially realized full-chain independent control, covering monomer synthesis, precise molecular structure regulation and 10,000-ton continuous production. This breakthrough not only breaks the 20-year-long technological monopoly of overseas enterprises in the field of high-end epoxy polyether silicone oil, but also directly provides key functional material support with stable performance and safe supply chains for dozens of downstream core industries including new textile materials, water-based coatings, new energy battery additives and biomedical materials. It marks that China's organosilicon modified surfactant industry has officially moved from the follow-up imitation stage to a brand-new development cycle of differentiated leadership in the global high-end market.
Epoxy polyether silicone oil is a special organosilicon modified material with both epoxy active groups and polyether hydrophilic segments grafted on the main chain of polysiloxane. It skillfully integrates three core advantages: the low surface tension, high and low temperature resistance and low volatility of the organosilicon skeleton, the water solubility, emulsification and dispersion capacity of polyether segments, and the high reactivity of epoxy groups. It is one of the few key additive categories in the current industrial field that can simultaneously achieve the triple functions of "interface modification + chemical bonding + environmental friendliness". Different from ordinary polyether silicone oil, which can only attach to the material surface through physical adsorption, the epoxy groups on the molecular chain of epoxy polyether silicone oil can undergo ring-opening reactions with various active groups such as hydroxyl, amino and carboxyl groups under mild conditions, and be permanently fixed on the substrate surface through chemical bonding. This completely solves the long-standing common industry pain points of traditional organosilicon additives, including easy migration, easy precipitation and poor durability. For a long time in the past, the domestically mass-produced epoxy polyether silicone oil in China was mostly concentrated in mid-to-low-end categories with low epoxy value and narrow polyether distribution, which could only meet basic scenario requirements such as ordinary fabric softening finishing and low-end coating leveling agents. High-end products with stably controlled epoxy value in the range of 0.2-0.6mol/100g, polyether segment distribution coefficient lower than 1.1 and no residual small molecule solvents have long faced technical bottlenecks such as high difficulty in molecular structure design, low grafting reaction selectivity and poor batch stability. Nearly 90% of the demand in downstream high-end application fields relied on imported products, which not only kept procurement costs high, but also resulted in a delivery cycle of 4-6 months. Some special customized grades involving new energy and biomedical applications have long faced supply restrictions from overseas manufacturers, seriously restricting the technological upgrading pace of downstream industries.
The full-chain technological breakthrough completed by China's industrial community this time has corely overcome three key technical difficulties that have restricted the development of the industry for a long time. First, the green synthesis technology of high-purity epoxy modified silane monomers has realized full-process industrialization. The technical team abandoned the traditional high-pollution and high-by-product process of chlorosilane alcoholysis-epoxidation, and innovatively adopted a brand-new continuous route of hydrosilylation coupled with in-situ epoxidation. By introducing a phase transfer catalysis and dynamic temperature control unit into the reaction system, the selectivity of the epoxidation reaction is increased to 96%, and the purity of the final epoxy silane monomer stably reaches 99.9%, completely eliminating the common chlorine impurity residue and epoxy group hydrolysis problems in traditional processes, and providing a high-purity raw material foundation for the subsequent copolymerization reaction of epoxy polyether silicone oil. Second, the precise molecular regulation technology for simultaneous grafting of epoxy-polyether difunctional groups has realized large-scale application. The team innovatively developed a special anionic ring-opening polymerization system modified by fluorosilicone. By introducing an online infrared spectrum real-time monitoring system during the reaction process, the uniform random distribution of epoxy groups and polyether segments with different molecular weights on the polysiloxane main chain is achieved, completely avoiding the defects of local functional group agglomeration and excessively wide molecular chain distribution common in the traditional step-by-step grafting process. For the final high-end epoxy polyether silicone oil product, the epoxy value can be precisely customized within the range of 0.1-0.7mol/100g, the molecular weight distribution coefficient of the polyether segment is controlled within 1.08, and the kinematic viscosity error between different batches is controlled within ±1.5%, far better than the industry benchmark level of ±6% for similar overseas products. Third, the extreme solvent-free purification system has been fully established. Aiming at high-end downstream scenarios with low precipitation requirements, the team built a purification system combining multi-stage short-path molecular distillation and supercritical carbon dioxide extraction, controlling the residual amount of unreacted small molecule siloxanes in the product below 30ppm. The VOC content of the product is lower than 20mg/kg, fully meeting the latest EU environmental regulations. The volatile content is only 0.08% after constant temperature baking at 150°C for 72 hours, far lower than the average level of 0.5% of traditional process products.
At present, this independently developed high-end epoxy polyether silicone oil has completed long-term large-scale application verification in multiple domestic core high-end industrial fields. In the field of high-end new textile materials, the new-generation functional fabric finishing agent prepared with this epoxy polyether silicone oil permanently fixes the organosilicon segments on the surface of various fibers such as cotton, polyester and wool through the chemical bonding between epoxy groups and hydroxyl groups on the fiber surface. The treated fabric not only has extremely soft hand feel, but also has excellent washing resistance. After 50 times of standard washing, the softness retention rate of the fabric still exceeds 92%, and there is no yellowing problem common to traditional softeners, with a whiteness retention rate of 98%. Related products have been batch applied in high-end outdoor sports fabrics, infant skin-friendly fabrics, medical protective textiles and other fields, completely replacing the high-end organosilicon finishing agents that have long relied on imports. In the field of water-based industrial coatings, the water-based polyurethane coating prepared with this epoxy polyether silicone oil as the core additive can not only reduce the surface tension of the coating system to 21mN/m, realizing perfect wetting of various substrates such as metal, plastic and wood, but also form a dense organosilicon enrichment layer on the coating surface through the cross-linking reaction between epoxy groups and the coating matrix. This improves the friction resistance of the coating by 60%, and the stain resistance reaches the highest level 0. At the same time, it completely avoids the problems of poor recoatability and coating shrinkage cavities that are common to ordinary polyether silicone oil additives, and has been widely used in high-end scenarios such as water-based paints for new energy vehicle bodies and environmentally friendly coatings for construction machinery. In the field of new energy batteries, this epoxy polyether silicone oil, as a dispersing additive for lithium battery pole piece coating, can greatly improve the dispersion uniformity of cathode active materials and conductive agents in the water-based slurry, controlling the coating thickness error of the pole piece within ±0.5μm. At the same time, the epoxy groups can undergo cross-linking reaction with the binder molecules to improve the adhesion between the pole piece coating and the current collector. During the high-rate charge-discharge cycle of the battery, the pole piece will not have the problem of coating falling off, and the cycle life of the battery is increased by 35%. This technology has been batch applied on the production lines of leading domestic power battery enterprises. In the field of biomedical materials, the surface coating of medical catheters modified with this high-purity epoxy polyether silicone oil forms a stable hydrophilic lubricating layer on the surface of the catheter through the covalent bonding between epoxy groups and the medical polymer substrate. The friction coefficient on the surface of the catheter is reduced to 0.02, which can greatly reduce the damage to human tissues during clinical interventional operations. Meanwhile, no small molecule precipitation occurs in the coating, and the biocompatibility reaches the medical grade standard. It has entered the clinical verification stage of Class III medical devices.
The latest market data released by industry research institutions shows that in the first half of 2026, the market demand for domestic high-end epoxy polyether silicone oil increased by 212% year-on-year compared with the same period in 2025. The market pattern where nearly 90% of high-end special epoxy polyether silicone oil relied on imports before has rapidly transformed, with domestically produced materials occupying 52% of the market share following this domestic technological breakthrough. The procurement cost for downstream core users has directly decreased by 58%, the supply chain delivery cycle has been shortened from the original 6 months to less than 10 days, and the delivery cycle of special customized grades has been shortened from the original 3 months to 72 hours. With the subsequent commissioning of multiple supporting production lines, it is expected that the market penetration rate of domestically produced high-end epoxy polyether silicone oil will exceed 95% by 2029. It will not only fully meet the demand of domestic downstream high-end industries, but also greatly enhance the core competitiveness of China's modified organosilicon materials in the global high-end functional additive market. Experts from industry associations estimate that the full localization of this material will directly drive the technological upgrading of the downstream industrial chain with a scale of nearly 1.2 trillion yuan, covering high-end textiles, water-based coatings, new energy and biomedicine, injecting key material impetus into the high-end and green transformation of China's fine chemical industry.
